Yamaha - Water Tube - Cooling System Transfer - 6H3-44361-11-00

Overview

The water tube is one of those parts that has to be right every time you drop the lower unit back on. I’ve seen good water pumps fail to deliver proper flow just because the tube didn’t seat correctly or was slightly damaged. It’s a simple piece, but it carries all the cooling water up to the powerhead. When it’s lined up and sealed right, your cooling system does exactly what it’s supposed to.

Key Features

• Direct Cooling Water Transfer – Moves water from the lower unit to the engine for proper temperature control.
• Precision Alignment Fit – Built to Yamaha specs to ensure correct positioning during installation.
• Corrosion-Resistant Material – Designed to withstand constant exposure to water and marine conditions.
• Consistent Cooling Support – Helps maintain steady water flow to prevent overheating.
• Service-Friendly Component – Ideal to inspect or replace during lower unit or water pump service.

Engine & Boat Compatibility

Designed for Yamaha outboards with compatible cooling systems and lower unit configurations. Commonly used across small to mid-size engines on fishing boats, skiffs, and recreational vessels. Always verify compatibility with your specific engine before installation.

FAQ

Q: What happens if the water tube isn’t installed correctly?
A: It can restrict or completely stop water flow, leading to overheating very quickly.

Q: How do I know if this tube is damaged?
A: Look for bends, corrosion, or poor sealing—these can all affect water flow.

Q: Should I replace this during water pump service?
A: It’s not always required, but it’s smart to inspect it while everything is apart.

Q: Can debris affect this part?
A: Over time, buildup or debris can impact flow, especially if the cooling system isn’t flushed regularly.

Q: Is installation difficult?
A: It’s straightforward, but proper alignment when reinstalling the lower unit is critical.